An immune system illness is a condition in which your insusceptible framework erroneously assaults your body.The invulnerable framework ordinarily makes preparations for germs like microorganisms and infections. When it detects these remote trespassers, it conveys a multitude of contender cells to assault them.Normally, the insusceptible framework can differentiate between outside cells and your own cells.In an immune system infection, the invulnerable framework botches some portion of your body like your joints or skin as outside. It discharges proteins called autoantibodies that assault solid cells. Some immune system illnesses target just a single organ. Type 1 diabetes harms the pancreas. Different ailments, similar to lupus, influence the entire body.